Offshore　wind　power　generation　is　a　promising　technology　in　renewable　energy　applications　due　to　its　high　reserves　of　wind　energy　in　sea　areas.　To　improve　the　energy　transformation　efficiency,　the　blade　length　of　the　offshore　wind　turbines　has　become　larger　and　larger,　and　it　has　made　rain　erosion　be　one　of　the　most　frequent　failures　during　the　turbine　operation.　As　the　natural　rainfall　is　stochastic　in　spatial　and　time　domains,　it　is　difficult　to　depict　the　damage　evolution　process　caused　by　rain　impact　exactly.　Therefore,　regular　and　continuous　droplet　impact　simulation　and　experiments　present　an　alternative　methodology　for　this　issue.　With　the　composite　structure　of　the　blade　and　deformability　of　the　liquid　droplet　in　consideration,　a　fluid　solid　interaction　model　will　be　established　to　investigate　the　impact　response　and　subsequent　damage　evolution.　In　which,　the　Smooth　Particle　Hydrodynamics　(SPH)　model　is　utilized　to　depict　the　constitutive　relationship　within　the　droplet,　and　Finite　Element　Method　(FEM)　is　used　to　construct　the　Representative　Volume　Element　(RVE)　model　of　the　blade　leading　edge.　The　impact　process　is　simulated　first　to　obtain　the　impact　pressure　distribution　at　the　contact　center　and　velocity　field　in　the　droplet.　Furthermore,　the　stress　wave　propagation　in　the　blade　multilayer　structure　can　be　analyzed.　Owing　to　the　multiaxial　fatigue　feature　of　the　continuous　droplet　impact,　the　continuum　damage　mechanics　is　integrated　with　the　fatigue　criterion　and　the　Jump-in-Cycle　procedure　is　used　to　simulate　the　high-　cycle　fatigue　process.　The　damage　factor　distribution　on　the　blade　coating　surface　and　its　influence　on　mechanical　properties　are　analyzed.　Thereafter,　the　droplet　impact　fatigue　life　can　be　accumulated　based　on　Miner＇s　linear　rules.　The　theoretical　achievements　are　validated　by　experimental　data　provided　by　Rain　Erosion　Testing　(RET),　which　shows　a　good　agreement　between　each　other.　As　a　result,　V-N　curves　and　D-N　curves,　i.e.　quantitative　relationship　between　droplet　falling　conditions　and　impact　fatigue　life,　are　established.　The　achievements　in　this　study　can　provide　an　effective　tool　for　rain　erosion　mechanism　analysis　and　life　prediction　in　industrial　applications.